总览无持仓时仍显示灰色禁用平仓按钮，避免操作列只剩打开。

Co-authored-by: Cursor <cursoragent@cursor.com>

templates/dashboard.html

@@ -15,6 +15,6 @@
 <div id="overview-grid"></div>
 {% endblock %}
 {% block scripts %}
-<script src="{{ url_for('static', filename='hub.js') }}?v=16"></script>
+<script src="{{ url_for('static', filename='hub.js') }}?v=17"></script>
 <script>HubOverview.boot();</script>
 {% endblock %}